A remote part of the Dampier Peninsula in Western Australia is home to more than 20 different types of dinosaur tracks, which play a role in Dreamtime stories created by the traditional custodians of the land, the Goolarabooloo people. University of Queensland palaeontologists, invited to the region by Goolarabooloo man Phillip Roe, identified 21 different types of tracks between 2011 and 2016, officially unveiling it as one of the most diverse collections in the world. âIt is extremely significant, forming the primary record of non-avian dinosaurs in the western half the continent and providing the only glimpse of Australiaâs dinosaur fauna during the first half of the Early Cretaceous Period,â the studyâs lead author Dr Steve Salisbury said. âItâs such a magical place â Australiaâs own Jurassic Park, in a spectacular wilderness setting.â The team spent more than 400 hours on the reef of the peninsula, located near James Price Point in the Kimberley region, finding and carefully recording tracks. It was a challenge for the group, who used drones to map their findings when a high tide obstructed their path. Aerial footage recorded at the site shows some of the tracks embedded in the rock, the rich ochre of the landscape and the team at work in a variety of locations. Thanks to their research, the area was listed as a National Heritage site, forcing the collapse of a planned gas extraction project. Credit: University of Queensland via Storyful

THE giant space rock that wiped out the dinosaurs may have set off a chain of cataclysmic volcanic eruptions on land and undersea, claims a new study that is already dividing scientists.

About 66 million years ago a 9.5km wide asteroid smacked into Earth, creating the Chicxulub crater in the Yucatán and sparking deadly chaos. Superhot particles rained from the air causing fires across the globe and sending temperatures higher. Then it got worse.

Clouds of particles reflected the sun’s energy away, darkening the skies and cooling Earth at least 25 degrees Celsius for several years, scientists said. And that big hit set off earthquakes close to 100 times stronger than the biggest we’ve seen in modern times.

It was enough to kill off three-quarters of the life on Earth, especially most of the creatures and plants on land.

But there were even more reverberations, possibly deadly ones, the new study says.

New evidence suggests all that shaking triggered massive volcanic eruptions that spewed gases and particles into the air and water too.

A study in the journal Science Advances figures sometime after the asteroid crash, unusual and extra strong eruptions happened on the floor of the oceans, probably in what are now the Pacific and Indian oceans. The study authors calculate that those ejected a tremendous amount of molten rock underwater — so much that on land it would cover the entire continental United States a couple hundred feet deep or so.

“We’re showing there was a lot more going on than we thought,” said University of Minnesota geophysicist Joseph Byrnes, the study’s lead author. “We’re painting a new sequence of events.”

Sometime after the asteroid crash, unusual and extra strong eruptions took place, the study claims.Source:AFP

These underwater volcanic areas — called mid-ocean ridges — often erupt, even today. But this happened on a far bigger scale.

What happened inside the underwater volcanoes is “totally analogous to a can of Coke that gets shaken. The whole thing turns into a frothy mess,” said University of California, Berkeley geologist Paul Renne, who wasn’t part of the study but said it “illustrates how intertwined everything else is.”

The study’s authors say their work hints that the underwater eruptions helped turn the oceans more acidic and added to extinction carnage, but they said they need more research to go that extra step.

Scientists are split, sometimes heatedly, over what really triggered the worst of the extinction, the impact of the crater and its plumes of debris or other upheaval of the Earth’s crust in the wake of the collision.

A study in 2015 suggested that the collision made volcanic eruptions in India that scientists have long known about, called the Deccan traps, far more intense and deadly. But if that were true, scientists said there should be evidence of increased volcanic activity elsewhere around the world, including underwater.

“We’re painting a new sequence of events,” the downfall of the dinosaurs, researchers said.Source:News Limited

This new study found just those eruptions, bolstering the theory that connects hyped-up volcanic activity globally to the initial collision, said study co-author Leif Karlstrom, an Earth sciences professor at the University of Oregon. Scientists who downplay volcanic effects said the new study doesn’t prove its case.

“The signal that they see is really kind of feeble,” said Jay Melosh of Purdue University. “There’s something there, maybe. Whether it has to do with the impact is more questionable.” Both Melosh and Sean Gulick of the University of Texas, who dug deep into the crater core recently, said the study is based on coincidental timing and doesn’t show a precise physical way the impact could have caused eruptions. It doesn’t help that because the ocean floor is so poorly explored, Byrnes and Karlstrom can only pin the date of the eruptions to a wide time band, one million years long.

That doesn’t bother Renne. He said the asteroid collision is an event that only happens once every 100 million years, and the Indian volcanic eruption is the type that happens once every 30 million years, so for the two to happen at the same time and not be related “is really pushing it.” The situation may only be getting more chaotic, though: Even more glimpses into that time period are coming from research now underway, including about giant tsunamis on what is now inland northern United States and Croatia.

A Mansourasaurus shahinae on a coastline in what is now the Western Desert of Egypt approximately 80 million years ago. Picture: Andrew McAfeeSource:AFP